Employee Retirement Plans (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Actuarial loss	$ (5.3)	$ (9.4)	$ (71.9)
Amortization of actuarial loss	5.1	5.0	2.1
Curtailment	0.0	0.0	0.1
Total before income taxes	(0.2)	(4.4)	(69.7)
Income tax expense (benefit)	(0.1)	(1.6)	(25.9)
Net amount recognized in other comprehensive loss	$ (0.1)	$ (2.8)	$ (43.8)